/Engine/Plugins/Interchange/Runtime/Source/FactoryNodes/Public/InterchangeSceneVariantSetsFactoryNode.h
This function allow to retrieve the number of translated VariantSets' unique ids for this object.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Interchange | Node | SceneVariantSetFactory") int32 GetCustomVariantSetUidCount() const